No, and that's not their point.

They're saying if they were to lie to their customers, they'd want to make sure they're deceiving Google. In that case, having an easy way to detect that it's Google would make that trivial.

If you're a medium sized corporation that is subject to the whims of individual customers, no. If you are a gigantic global company that can position itself to weather any temporary inconvenience, absolutely yes.

I mean... The vast bulk of digital capitalism is information asymmetries. Lies by omission are nearly the currency of e-commerce.

Is it wise to intentionally refrain from offering the same price to a human you'd offer to the Google-bot? Possibly. Depends on your goals.